fitzgen/who-calls.py

## who-calls.py
#!/usr/bin/env python3

import argparse
import re
import subprocess

DESC = """

List the callers of some function in the given `.wasm` file.

Constructs the call graph of functions in the `.wasm` file and then queries
edges in that call graph.

Requires that the `wasm-objdump` tool from the WABT[0] is installed and on the
`$PATH`.

[0]: https://github.com/WebAssembly/wabt

## Example Usage

Print every caller of `std::panicking::begin_panic`:

    $ ./who-calls.py path/to/something.wasm \\
         --function "std::panicking::begin_panic::h59c9bbae5c8cc295"

Print the top 5 largest functions and their callers:

    $ ./who-calls.py path/to/something.wasm --top

"""

parser = argparse.ArgumentParser(
    formatter_class=argparse.RawDescriptionHelpFormatter,
    description=DESC)

parser.add_argument(
    "wasm_file",
    type=str,
    help="The input `.wasm` file.")

parser.add_argument(
    "--function",
    type=str,
    help="The function whose callers should be listed.")

parser.add_argument(
    "-t",
    "--top",
    type=int,
    default=None,
    help="Display the largest N functions and their callers")

parser.add_argument(
    "-d",
    "--max-depth",
    type=int,
    default=None,
    help="The maximum call stack depth to display")

def decode(f):
    return f.decode(encoding="utf-8", errors="ignore")

def run(cmd, **kwargs):
    kwargs["stdout"] = subprocess.PIPE
    child = subprocess.run(cmd, **kwargs)
    if child.returncode != 0:
        raise Exception("{} did not exit OK".format(str(cmd)))
    return decode(child.stdout)

def disassemble(args):
    return run(["wasm-objdump", "-d", args.wasm_file])

START_FUNCTION = re.compile(r"^(\w+) <([\w<>:\s]+)>:$")
CALL_FUNCTION = re.compile(r"^ \w+: [\w ]*\|\s*call \w+ <([\w<>:\s]+)>$")

def parse_call_graph(disassembly, args):
    call_graph = {}
    current_function = None

    for line in disassembly.splitlines():
        match = re.match(START_FUNCTION, line)
        if match:
            current_function = match.groups()[1]
            call_graph[current_function] = set()
            continue

        match = re.match(CALL_FUNCTION, line)
        if match and current_function:
            call_graph[current_function].add(match.groups()[0])

    return call_graph

def parse_top_functions(disassembly, args):
    functions = []
    last_function = None

    for line in disassembly.splitlines():
        match = re.match(START_FUNCTION, line)
        if match:
            (start, function) = match.groups()
            start = int(start, 16)
            if last_function:
                (f, last_start) = last_function
                functions.append((f, start - last_start))
            last_function = (function, start)

    top_functions = sorted(functions, key=lambda a: a[1], reverse=True)
    return top_functions[:args.top]

def reverse_call_graph(call_graph, args):
    reversed_call_graph = {}

    for function, calls in call_graph.items():
        if function not in reversed_call_graph:
            reversed_call_graph[function] = set()

        for call in calls:
            if call not in reversed_call_graph:
                reversed_call_graph[call] = set()
            reversed_call_graph[call].add(function)

    return reversed_call_graph

def print_callers(reversed_call_graph, args, function=None, depth=0, seen=set()):
    if not function:
        function = args.function

    if depth == 0:
        depth += 1
        print("{}".format(function))
        if function not in reversed_call_graph:
            print("    <function not defined>")
            return

    for caller in reversed_call_graph[function]:
        indent = ""
        for _ in range(0, depth):
            indent += "    "

        print("{}⬑ {}".format(indent, caller))

        if caller not in seen and (args.max_depth is None or depth < args.max_depth):
            seen.add(caller)
            print_callers(reversed_call_graph, args, function=caller, depth=depth+1, seen=seen)

def main():
    args = parser.parse_args()
    disassembly = disassemble(args)
    call_graph = parse_call_graph(disassembly, args)
    reversed_call_graph = reverse_call_graph(call_graph, args)

    if args.function:
        print_callers(reversed_call_graph, args)
    elif args.top:
        top_functions = parse_top_functions(disassembly, args)
        for f, size in top_functions:
            print(size, "bytes:")
            print_callers(reversed_call_graph, args, function=f)
            print()
    else:
        raise Exception("Must use one of --function or --top")

if __name__ == "__main__":
    main()

## zzz-example-output-1.txt
$ ./who-calls.py target/wasm32-unknown-unknown/release/source_map_mappings_wasm_api.opt.wasm \\
     --function "std::panicking::begin_panic_fmt::h6b6a5045bf7a8311"
std::panicking::begin_panic_fmt::h6b6a5045bf7a8311
    ⬑ generated_location_for
    ⬑ allocate_mappings
    ⬑ parse_mappings
    ⬑ original_location_for
    ⬑ core::panicking::panic_fmt::he95e6f0e21885985
        ⬑ core::slice::slice_index_len_fail::h0c62925fe2252838
            ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
                ⬑ std::panicking::begin_panic::hb089ba7cfbb22318
                    ⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
                        ⬑ source_map_mappings::sort::do_quick_sort::hde52290b1b9201cc
                            ⬑ source_map_mappings::sort::do_quick_sort::hde52290b1b9201cc
                            ⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
                                ⬑ all_generated_locations_for
                                ⬑ by_original_location
                                ⬑ generated_location_for
                        ⬑ source_map_mappings::sort::do_quick_sort::h8a0fabcee7f70118
                            ⬑ source_map_mappings::sort::do_quick_sort::h8a0fabcee7f70118
                            ⬑ parse_mappings
                    ⬑ parse_mappings
                ⬑ std::panicking::begin_panic::h59c9bbae5c8cc295
                    ⬑ std::panicking::begin_panic_fmt::h6b6a5045bf7a8311
                        ⬑ generated_location_for
                        ⬑ allocate_mappings
                        ⬑ parse_mappings
                        ⬑ original_location_for
                        ⬑ core::panicking::panic_fmt::he95e6f0e21885985
                ⬑ std::panicking::begin_panic::h63e35c2db9daa46f
                    ⬑ <std::thread::local::LocalKey<T>>::try_with::h282e06b1430b7131
                        ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
                    ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
            ⬑ core::char_private::check::hbec220ddcd84fbe8
                ⬑ core::char_private::is_printable::hef17caa7cedaa45e
                    ⬑ core::fmt::Write::write_fmt::hfe66dc2c11f06023
                        ⬑ std::panicking::begin_panic_fmt::h6b6a5045bf7a8311
                    ⬑ <char as core::fmt::Debug>::fmt::h2746778dae637484
        ⬑ core::result::unwrap_failed::h303cf7c77329cf85
            ⬑ get_last_error
            ⬑ parse_mappings
        ⬑ core::option::expect_failed::h841b03527805d3d3
            ⬑ <alloc::vec::Vec<T>>::extend_from_slice::h5afd22416635e8d7
                ⬑ core::ptr::drop_in_place::h3f9d4ba6261882a6
            ⬑ <alloc::vec::Vec<T>>::extend_from_slice::h82a1bcb67712e202
                ⬑ std::io::error::Error::new::h14956c84e93b0007
                    ⬑ std::io::Write::write_all::h4a2e1d1753837a69
                        ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
                        ⬑ core::ptr::drop_in_place::h01c992b2a38446bc
                        ⬑ core::fmt::Write::write_char::hd0c82db72b3c6fd5
                            ⬑ core::ptr::drop_in_place::h3f9d4ba6261882a6
                    ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
                    ⬑ std::io::Write::write_fmt::h6f93bad64abded4d
                        ⬑ std::sys_common::util::dumb_print::h08caa4e4a69ce437
                            ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
                        ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
            ⬑ parse_mappings
            ⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
            ⬑ allocate_mappings
        ⬑ core::result::unwrap_failed::ha4f67c374d262ff6
            ⬑ <std::thread::local::LocalKey<T>>::try_with::h282e06b1430b7131
        ⬑ core::result::unwrap_failed::h0d23a36b00c86a70
            ⬑ <std::thread::local::LocalKey<T>>::try_with::h282e06b1430b7131
            ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
        ⬑ core::slice::slice_index_order_fail::h5047276ce7ab5559
            ⬑ core::char_private::check::hbec220ddcd84fbe8
        ⬑ core::panicking::panic_bounds_check::hf426de951c6773a2
            ⬑ core::fmt::write::h3fdcfa41538f8361
                ⬑ core::fmt::Write::write_fmt::hcf209b9ab583bfd9
                ⬑ core::ptr::drop_in_place::h3f9d4ba6261882a6
                ⬑ <core::ops::range::Range<Idx> as core::fmt::Debug>::fmt::h963c041bf5a11a92
                ⬑ core::fmt::num::<impl core::fmt::Display for usize>::fmt::h190ae91f4e6e797c
                    ⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
                    ⬑ core::fmt::num::<impl core::fmt::Debug for usize>::fmt::hac7e5e02de6d35bc
                ⬑ core::fmt::builders::DebugTuple::field::h29d9f36ce3e7b021
                    ⬑ std::error::Error::type_id::h9d0f8f179effe427
                ⬑ core::fmt::Write::write_fmt::h8135df65faa514f9
                ⬑ core::fmt::Write::write_fmt::hfe66dc2c11f06023
                ⬑ std::io::Write::write_fmt::h6f93bad64abded4d
            ⬑ all_generated_locations_for
            ⬑ original_location_for
            ⬑ generated_location_for
        ⬑ core::str::slice_error_fail::h2de2c9b902e4c2f4
            ⬑ core::str::slice_error_fail::h2de2c9b902e4c2f4
            ⬑ <core::cell::BorrowMutError as core::fmt::Debug>::fmt::h75621c8fb5cc826a
            ⬑ core::fmt::Formatter::pad::h33d7155441061e69
                ⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
                ⬑ std::error::Error::type_id::h9d0f8f179effe427
            ⬑ core::fmt::Write::write_fmt::hfe66dc2c11f06023
        ⬑ core::result::unwrap_failed::h2ef4fcdd006ccc3e
            ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
            ⬑ <std::thread::local::LocalKey<T>>::with::h6962dc74436e3e5a
                ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
        ⬑ core::panicking::panic::h0c8240d335aa06f1
            ⬑ core::fmt::write::h3fdcfa41538f8361
            ⬑ <alloc::vec::Vec<T>>::extend_from_slice::h5afd22416635e8d7
            ⬑ parse_mappings
            ⬑ generated_location_for
            ⬑ <alloc::vec::Vec<T>>::extend_from_slice::h82a1bcb67712e202
            ⬑ source_map_mappings::sort::do_quick_sort::h8a0fabcee7f70118
            ⬑ by_original_location
            ⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
            ⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
            ⬑ <source_map_mappings::Mappings<O>>::compute_column_spans::h304b76a7be460676
                ⬑ compute_column_spans
                ⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
            ⬑ by_generated_location
            ⬑ source_map_mappings::sort::do_quick_sort::hde52290b1b9201cc
            ⬑ all_generated_locations_for
            ⬑ core::str::slice_error_fail::h2de2c9b902e4c2f4
            ⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
            ⬑ original_location_for
            ⬑ <T as core::any::Any>::get_type_id::h855349fbd4c430f4
            ⬑ compute_column_spans
            ⬑ allocate_mappings
            ⬑ core::char_private::check::hbec220ddcd84fbe8
            ⬑ alloc::allocator::Layout::array::hdbe1bc1ebbc17fd3
                ⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
                ⬑ <source_map_mappings::Mappings<O>>::compute_column_spans::h304b76a7be460676

## zzz-example-output-2.txt
$ ./who-calls.py --top 5 --max-depth 2 target/wasm32-unknown-unknown/release/source_map_mappings_wasm_api.opt.wasm
3409 bytes:
dlmalloc::dlmalloc::Dlmalloc::malloc::hb7db7cffe7eae9d8
    ⬑ __rust_realloc
        ⬑ <alloc::vec::Vec<T>>::extend_from_slice::hbe130cc89ef92abc
        ⬑ <source_map_mappings::Mappings<O>>::by_original_location::hce8ace2a0e2a4bb3
        ⬑ <T as core::any::Any>::get_type_id::h8a116c174de7ff8c
        ⬑ <alloc::vec::Vec<T>>::extend_from_slice::ha11979e3f44fb95a
        ⬑ alloc::allocator::Layout::array::h9e9ad5f5ad4ae5c6
    ⬑ dlmalloc::dlmalloc::Dlmalloc::memalign::h441b1c2355f124c0
        ⬑ __rust_realloc
        ⬑ __rust_alloc
    ⬑ __rust_alloc
        ⬑ std::sys::wasm::unsupported::ha10f63ee1611f134
        ⬑ parse_mappings
        ⬑ std::sys::wasm::unsupported::h54aa47085aab4d9d
        ⬑ std::sys_common::thread_info::THREAD_INFO::__getit::ha84da844d11d72c3
        ⬑ std::panicking::begin_panic::he18ca0199c0c50e0
        ⬑ std::panicking::LOCAL_STDERR::__getit::hb68975c206e1a4f4
        ⬑ <T as core::any::Any>::get_type_id::h8a116c174de7ff8c
        ⬑ <std::thread::local::LocalKey<T>>::try_with::h04afe1b0f0a0454a
        ⬑ <alloc::vec::Vec<T>>::extend_from_slice::ha11979e3f44fb95a
        ⬑ alloc::allocator::Layout::array::h9e9ad5f5ad4ae5c6
        ⬑ std::panicking::begin_panic::haa8adef7fad5642e
        ⬑ <alloc::vec::Vec<T>>::extend_from_slice::hbe130cc89ef92abc
        ⬑ source_map_mappings_wasm_api::LAST_ERROR::__getit::h63c6eaba6115430a
        ⬑ <T as core::convert::Into<U>>::into::haa168c9fcbe3c9a5
        ⬑ std::panicking::begin_panic::h24d55e330bfd6ad4
        ⬑ std::panicking::update_panic_count::PANIC_COUNT::__getit::h7ed37a609a2cc76c
        ⬑ std::sys_common::thread_local::StaticKey::lazy_init::h55c1ea984aefb78e
        ⬑ allocate_mappings
        ⬑ <source_map_mappings::Mappings<O>>::by_original_location::hce8ace2a0e2a4bb3
        ⬑ std::sys::wasm::unsupported::h8a0c9d428e59c8b5
        ⬑ std::io::error::Error::new::h2062df6b85d29f4e

3008 bytes:
std::panicking::rust_panic_with_hook::h02b37a5538e89bc2
    ⬑ std::panicking::begin_panic::he18ca0199c0c50e0
        ⬑ std::panicking::begin_panic_fmt::h951592fd1be3d1f2
    ⬑ std::panicking::begin_panic::haa8adef7fad5642e
        ⬑ rand::Rng::gen_range::h0f7e11b952ead81c
    ⬑ std::panicking::begin_panic::h24d55e330bfd6ad4
        ⬑ std::panicking::rust_panic_with_hook::h02b37a5538e89bc2
        ⬑ <std::thread::local::LocalKey<T>>::try_with::h04afe1b0f0a0454a

1833 bytes:
core::str::slice_error_fail::h105f13cd96633aba
    ⬑ core::ptr::drop_in_place::hdb9b0daa1583986f
    ⬑ core::fmt::Formatter::pad::hb35b2f03e1c6174a
        ⬑ <T as core::any::Any>::get_type_id::hd6007c4034ea0caa
        ⬑ std::error::Error::type_id::h0e778952f812afba
    ⬑ core::str::slice_error_fail::h105f13cd96633aba
        ⬑ core::ptr::drop_in_place::hdb9b0daa1583986f
        ⬑ core::fmt::Formatter::pad::hb35b2f03e1c6174a
        ⬑ core::str::slice_error_fail::h105f13cd96633aba

1751 bytes:
parse_mappings

1315 bytes:
core::fmt::Formatter::pad_integral::ha821d9da14fd6ac2
    ⬑ core::fmt::num::<impl core::fmt::Display for usize>::fmt::h3ef074a904b5a6c9
        ⬑ core::fmt::num::<impl core::fmt::Debug for usize>::fmt::h064ef8bd351ca3c5
	#!/usr/bin/env python3

	import argparse
	import re
	import subprocess

	DESC = """

	List the callers of some function in the given `.wasm` file.

	Constructs the call graph of functions in the `.wasm` file and then queries
	edges in that call graph.

	Requires that the `wasm-objdump` tool from the WABT[0] is installed and on the
	`$PATH`.

	[0]: https://github.com/WebAssembly/wabt

	## Example Usage

	Print every caller of `std::panicking::begin_panic`:

	$ ./who-calls.py path/to/something.wasm \\
	--function "std::panicking::begin_panic::h59c9bbae5c8cc295"

	Print the top 5 largest functions and their callers:

	$ ./who-calls.py path/to/something.wasm --top

	"""

	parser = argparse.ArgumentParser(
	formatter_class=argparse.RawDescriptionHelpFormatter,
	description=DESC)

	parser.add_argument(
	"wasm_file",
	type=str,
	help="The input `.wasm` file.")

	parser.add_argument(
	"--function",
	type=str,
	help="The function whose callers should be listed.")

	parser.add_argument(
	"-t",
	"--top",
	type=int,
	default=None,
	help="Display the largest N functions and their callers")

	parser.add_argument(
	"-d",
	"--max-depth",
	type=int,
	default=None,
	help="The maximum call stack depth to display")

	def decode(f):
	return f.decode(encoding="utf-8", errors="ignore")

	def run(cmd, **kwargs):
	kwargs["stdout"] = subprocess.PIPE
	child = subprocess.run(cmd, **kwargs)
	if child.returncode != 0:
	raise Exception("{} did not exit OK".format(str(cmd)))
	return decode(child.stdout)

	def disassemble(args):
	return run(["wasm-objdump", "-d", args.wasm_file])

	START_FUNCTION = re.compile(r"^(\w+) <([\w<>:\s]+)>:$")
	CALL_FUNCTION = re.compile(r"^ \w+: [\w ]\\|\scall \w+ <([\w<>:\s]+)>$")

	def parse_call_graph(disassembly, args):
	call_graph = {}
	current_function = None

	for line in disassembly.splitlines():
	match = re.match(START_FUNCTION, line)
	if match:
	current_function = match.groups()[1]
	call_graph[current_function] = set()
	continue

	match = re.match(CALL_FUNCTION, line)
	if match and current_function:
	call_graph[current_function].add(match.groups()[0])

	return call_graph

	def parse_top_functions(disassembly, args):
	functions = []
	last_function = None

	for line in disassembly.splitlines():
	match = re.match(START_FUNCTION, line)
	if match:
	(start, function) = match.groups()
	start = int(start, 16)
	if last_function:
	(f, last_start) = last_function
	functions.append((f, start - last_start))
	last_function = (function, start)

	top_functions = sorted(functions, key=lambda a: a[1], reverse=True)
	return top_functions[:args.top]

	def reverse_call_graph(call_graph, args):
	reversed_call_graph = {}

	for function, calls in call_graph.items():
	if function not in reversed_call_graph:
	reversed_call_graph[function] = set()

	for call in calls:
	if call not in reversed_call_graph:
	reversed_call_graph[call] = set()
	reversed_call_graph[call].add(function)

	return reversed_call_graph

	def print_callers(reversed_call_graph, args, function=None, depth=0, seen=set()):
	if not function:
	function = args.function

	if depth == 0:
	depth += 1
	print("{}".format(function))
	if function not in reversed_call_graph:
	print(" <function not defined>")
	return

	for caller in reversed_call_graph[function]:
	indent = ""
	for _ in range(0, depth):
	indent += " "

	print("{}⬑ {}".format(indent, caller))

	if caller not in seen and (args.max_depth is None or depth < args.max_depth):
	seen.add(caller)
	print_callers(reversed_call_graph, args, function=caller, depth=depth+1, seen=seen)

	def main():
	args = parser.parse_args()
	disassembly = disassemble(args)
	call_graph = parse_call_graph(disassembly, args)
	reversed_call_graph = reverse_call_graph(call_graph, args)

	if args.function:
	print_callers(reversed_call_graph, args)
	elif args.top:
	top_functions = parse_top_functions(disassembly, args)
	for f, size in top_functions:
	print(size, "bytes:")
	print_callers(reversed_call_graph, args, function=f)
	print()
	else:
	raise Exception("Must use one of --function or --top")

	if __name__ == "__main__":
	main()
	$ ./who-calls.py target/wasm32-unknown-unknown/release/source_map_mappings_wasm_api.opt.wasm \\
	--function "std::panicking::begin_panic_fmt::h6b6a5045bf7a8311"
	std::panicking::begin_panic_fmt::h6b6a5045bf7a8311
	⬑ generated_location_for
	⬑ allocate_mappings
	⬑ parse_mappings
	⬑ original_location_for
	⬑ core::panicking::panic_fmt::he95e6f0e21885985
	⬑ core::slice::slice_index_len_fail::h0c62925fe2252838
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ std::panicking::begin_panic::hb089ba7cfbb22318
	⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
	⬑ source_map_mappings::sort::do_quick_sort::hde52290b1b9201cc
	⬑ source_map_mappings::sort::do_quick_sort::hde52290b1b9201cc
	⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
	⬑ all_generated_locations_for
	⬑ by_original_location
	⬑ generated_location_for
	⬑ source_map_mappings::sort::do_quick_sort::h8a0fabcee7f70118
	⬑ source_map_mappings::sort::do_quick_sort::h8a0fabcee7f70118
	⬑ parse_mappings
	⬑ parse_mappings
	⬑ std::panicking::begin_panic::h59c9bbae5c8cc295
	⬑ std::panicking::begin_panic_fmt::h6b6a5045bf7a8311
	⬑ generated_location_for
	⬑ allocate_mappings
	⬑ parse_mappings
	⬑ original_location_for
	⬑ core::panicking::panic_fmt::he95e6f0e21885985
	⬑ std::panicking::begin_panic::h63e35c2db9daa46f
	⬑ <std::thread::local::LocalKey<T>>::try_with::h282e06b1430b7131
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ core::char_private::check::hbec220ddcd84fbe8
	⬑ core::char_private::is_printable::hef17caa7cedaa45e
	⬑ core::fmt::Write::write_fmt::hfe66dc2c11f06023
	⬑ std::panicking::begin_panic_fmt::h6b6a5045bf7a8311
	⬑ <char as core::fmt::Debug>::fmt::h2746778dae637484
	⬑ core::result::unwrap_failed::h303cf7c77329cf85
	⬑ get_last_error
	⬑ parse_mappings
	⬑ core::option::expect_failed::h841b03527805d3d3
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::h5afd22416635e8d7
	⬑ core::ptr::drop_in_place::h3f9d4ba6261882a6
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::h82a1bcb67712e202
	⬑ std::io::error::Error::new::h14956c84e93b0007
	⬑ std::io::Write::write_all::h4a2e1d1753837a69
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ core::ptr::drop_in_place::h01c992b2a38446bc
	⬑ core::fmt::Write::write_char::hd0c82db72b3c6fd5
	⬑ core::ptr::drop_in_place::h3f9d4ba6261882a6
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ std::io::Write::write_fmt::h6f93bad64abded4d
	⬑ std::sys_common::util::dumb_print::h08caa4e4a69ce437
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ parse_mappings
	⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
	⬑ allocate_mappings
	⬑ core::result::unwrap_failed::ha4f67c374d262ff6
	⬑ <std::thread::local::LocalKey<T>>::try_with::h282e06b1430b7131
	⬑ core::result::unwrap_failed::h0d23a36b00c86a70
	⬑ <std::thread::local::LocalKey<T>>::try_with::h282e06b1430b7131
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ core::slice::slice_index_order_fail::h5047276ce7ab5559
	⬑ core::char_private::check::hbec220ddcd84fbe8
	⬑ core::panicking::panic_bounds_check::hf426de951c6773a2
	⬑ core::fmt::write::h3fdcfa41538f8361
	⬑ core::fmt::Write::write_fmt::hcf209b9ab583bfd9
	⬑ core::ptr::drop_in_place::h3f9d4ba6261882a6
	⬑ <core::ops::range::Range<Idx> as core::fmt::Debug>::fmt::h963c041bf5a11a92
	⬑ core::fmt::num::<impl core::fmt::Display for usize>::fmt::h190ae91f4e6e797c
	⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
	⬑ core::fmt::num::<impl core::fmt::Debug for usize>::fmt::hac7e5e02de6d35bc
	⬑ core::fmt::builders::DebugTuple::field::h29d9f36ce3e7b021
	⬑ std::error::Error::type_id::h9d0f8f179effe427
	⬑ core::fmt::Write::write_fmt::h8135df65faa514f9
	⬑ core::fmt::Write::write_fmt::hfe66dc2c11f06023
	⬑ std::io::Write::write_fmt::h6f93bad64abded4d
	⬑ all_generated_locations_for
	⬑ original_location_for
	⬑ generated_location_for
	⬑ core::str::slice_error_fail::h2de2c9b902e4c2f4
	⬑ core::str::slice_error_fail::h2de2c9b902e4c2f4
	⬑ <core::cell::BorrowMutError as core::fmt::Debug>::fmt::h75621c8fb5cc826a
	⬑ core::fmt::Formatter::pad::h33d7155441061e69
	⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
	⬑ std::error::Error::type_id::h9d0f8f179effe427
	⬑ core::fmt::Write::write_fmt::hfe66dc2c11f06023
	⬑ core::result::unwrap_failed::h2ef4fcdd006ccc3e
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ <std::thread::local::LocalKey<T>>::with::h6962dc74436e3e5a
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ core::panicking::panic::h0c8240d335aa06f1
	⬑ core::fmt::write::h3fdcfa41538f8361
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::h5afd22416635e8d7
	⬑ parse_mappings
	⬑ generated_location_for
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::h82a1bcb67712e202
	⬑ source_map_mappings::sort::do_quick_sort::h8a0fabcee7f70118
	⬑ by_original_location
	⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
	⬑ std::panicking::rust_panic_with_hook::hfadcb90e20ba407f
	⬑ <source_map_mappings::Mappings<O>>::compute_column_spans::h304b76a7be460676
	⬑ compute_column_spans
	⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
	⬑ by_generated_location
	⬑ source_map_mappings::sort::do_quick_sort::hde52290b1b9201cc
	⬑ all_generated_locations_for
	⬑ core::str::slice_error_fail::h2de2c9b902e4c2f4
	⬑ rand::Rng::gen_range::h8ed2a1384a09f4b7
	⬑ original_location_for
	⬑ <T as core::any::Any>::get_type_id::h855349fbd4c430f4
	⬑ compute_column_spans
	⬑ allocate_mappings
	⬑ core::char_private::check::hbec220ddcd84fbe8
	⬑ alloc::allocator::Layout::array::hdbe1bc1ebbc17fd3
	⬑ <source_map_mappings::Mappings<O>>::by_original_location::h48efa2a342d4e146
	⬑ <source_map_mappings::Mappings<O>>::compute_column_spans::h304b76a7be460676
	$ ./who-calls.py --top 5 --max-depth 2 target/wasm32-unknown-unknown/release/source_map_mappings_wasm_api.opt.wasm
	3409 bytes:
	dlmalloc::dlmalloc::Dlmalloc::malloc::hb7db7cffe7eae9d8
	⬑ __rust_realloc
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::hbe130cc89ef92abc
	⬑ <source_map_mappings::Mappings<O>>::by_original_location::hce8ace2a0e2a4bb3
	⬑ <T as core::any::Any>::get_type_id::h8a116c174de7ff8c
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::ha11979e3f44fb95a
	⬑ alloc::allocator::Layout::array::h9e9ad5f5ad4ae5c6
	⬑ dlmalloc::dlmalloc::Dlmalloc::memalign::h441b1c2355f124c0
	⬑ __rust_realloc
	⬑ __rust_alloc
	⬑ __rust_alloc
	⬑ std::sys::wasm::unsupported::ha10f63ee1611f134
	⬑ parse_mappings
	⬑ std::sys::wasm::unsupported::h54aa47085aab4d9d
	⬑ std::sys_common::thread_info::THREAD_INFO::__getit::ha84da844d11d72c3
	⬑ std::panicking::begin_panic::he18ca0199c0c50e0
	⬑ std::panicking::LOCAL_STDERR::__getit::hb68975c206e1a4f4
	⬑ <T as core::any::Any>::get_type_id::h8a116c174de7ff8c
	⬑ <std::thread::local::LocalKey<T>>::try_with::h04afe1b0f0a0454a
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::ha11979e3f44fb95a
	⬑ alloc::allocator::Layout::array::h9e9ad5f5ad4ae5c6
	⬑ std::panicking::begin_panic::haa8adef7fad5642e
	⬑ <alloc::vec::Vec<T>>::extend_from_slice::hbe130cc89ef92abc
	⬑ source_map_mappings_wasm_api::LAST_ERROR::__getit::h63c6eaba6115430a
	⬑ <T as core::convert::Into<U>>::into::haa168c9fcbe3c9a5
	⬑ std::panicking::begin_panic::h24d55e330bfd6ad4
	⬑ std::panicking::update_panic_count::PANIC_COUNT::__getit::h7ed37a609a2cc76c
	⬑ std::sys_common::thread_local::StaticKey::lazy_init::h55c1ea984aefb78e
	⬑ allocate_mappings
	⬑ <source_map_mappings::Mappings<O>>::by_original_location::hce8ace2a0e2a4bb3
	⬑ std::sys::wasm::unsupported::h8a0c9d428e59c8b5
	⬑ std::io::error::Error::new::h2062df6b85d29f4e

	3008 bytes:
	std::panicking::rust_panic_with_hook::h02b37a5538e89bc2
	⬑ std::panicking::begin_panic::he18ca0199c0c50e0
	⬑ std::panicking::begin_panic_fmt::h951592fd1be3d1f2
	⬑ std::panicking::begin_panic::haa8adef7fad5642e
	⬑ rand::Rng::gen_range::h0f7e11b952ead81c
	⬑ std::panicking::begin_panic::h24d55e330bfd6ad4
	⬑ std::panicking::rust_panic_with_hook::h02b37a5538e89bc2
	⬑ <std::thread::local::LocalKey<T>>::try_with::h04afe1b0f0a0454a

	1833 bytes:
	core::str::slice_error_fail::h105f13cd96633aba
	⬑ core::ptr::drop_in_place::hdb9b0daa1583986f
	⬑ core::fmt::Formatter::pad::hb35b2f03e1c6174a
	⬑ <T as core::any::Any>::get_type_id::hd6007c4034ea0caa
	⬑ std::error::Error::type_id::h0e778952f812afba
	⬑ core::str::slice_error_fail::h105f13cd96633aba
	⬑ core::ptr::drop_in_place::hdb9b0daa1583986f
	⬑ core::fmt::Formatter::pad::hb35b2f03e1c6174a
	⬑ core::str::slice_error_fail::h105f13cd96633aba

	1751 bytes:
	parse_mappings

	1315 bytes:
	core::fmt::Formatter::pad_integral::ha821d9da14fd6ac2
	⬑ core::fmt::num::<impl core::fmt::Display for usize>::fmt::h3ef074a904b5a6c9
	⬑ core::fmt::num::<impl core::fmt::Debug for usize>::fmt::h064ef8bd351ca3c5